Absorption of waves by large-scale winds in stratified turbulence

The atmosphere is a nonlinear stratified fluid in which internal gravity waves are present. These waves interact with the flow, resulting in wave turbulence that displays important differences with the turbulence observed in isotropic and homogeneous flows. We study numerically the role of these wav...

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Autor principal:	Mininni, Pablo Daniel
Publicado:	2015
Materias:	Dispersions Turbulence Current theories Dispersion relations Homogeneous flow Horizontal layers Internal gravity waves Large-scale flows Stratified fluid Stratified turbulence Wind
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15393755_v91_n3_p_ClarkDiLeoni http://hdl.handle.net/20.500.12110/paper_15393755_v91_n3_p_ClarkDiLeoni
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_15393755_v91_n3_p_ClarkDiLeoni
record_format	dspace
spelling	paper:paper_15393755_v91_n3_p_ClarkDiLeoni2023-06-08T16:21:03Z Absorption of waves by large-scale winds in stratified turbulence Mininni, Pablo Daniel Dispersions Turbulence Current theories Dispersion relations Homogeneous flow Horizontal layers Internal gravity waves Large-scale flows Stratified fluid Stratified turbulence Wind The atmosphere is a nonlinear stratified fluid in which internal gravity waves are present. These waves interact with the flow, resulting in wave turbulence that displays important differences with the turbulence observed in isotropic and homogeneous flows. We study numerically the role of these waves and their interaction with the large-scale flow, consisting of vertically sheared horizontal winds. We calculate their space- and time-resolved energy spectrum (a four-dimensional spectrum) and show that most of the energy is concentrated along a dispersion relation that is Doppler shifted by the horizontal winds. We also observe that when uniform winds are let to develop in each horizontal layer of the flow, waves whose phase velocity is equal to the horizontal wind speed have negligible energy. This indicates a nonlocal transfer of their energy to the mean flow. Both phenomena, the Doppler shift and the absorption of waves traveling with the wind speed, are not accounted for in current theories of stratified wave turbulence. © 2015 American Physical Society. Fil:Mininni, P.D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15393755_v91_n3_p_ClarkDiLeoni http://hdl.handle.net/20.500.12110/paper_15393755_v91_n3_p_ClarkDiLeoni
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Dispersions Turbulence Current theories Dispersion relations Homogeneous flow Horizontal layers Internal gravity waves Large-scale flows Stratified fluid Stratified turbulence Wind
spellingShingle	Dispersions Turbulence Current theories Dispersion relations Homogeneous flow Horizontal layers Internal gravity waves Large-scale flows Stratified fluid Stratified turbulence Wind Mininni, Pablo Daniel Absorption of waves by large-scale winds in stratified turbulence
topic_facet	Dispersions Turbulence Current theories Dispersion relations Homogeneous flow Horizontal layers Internal gravity waves Large-scale flows Stratified fluid Stratified turbulence Wind
description	The atmosphere is a nonlinear stratified fluid in which internal gravity waves are present. These waves interact with the flow, resulting in wave turbulence that displays important differences with the turbulence observed in isotropic and homogeneous flows. We study numerically the role of these waves and their interaction with the large-scale flow, consisting of vertically sheared horizontal winds. We calculate their space- and time-resolved energy spectrum (a four-dimensional spectrum) and show that most of the energy is concentrated along a dispersion relation that is Doppler shifted by the horizontal winds. We also observe that when uniform winds are let to develop in each horizontal layer of the flow, waves whose phase velocity is equal to the horizontal wind speed have negligible energy. This indicates a nonlocal transfer of their energy to the mean flow. Both phenomena, the Doppler shift and the absorption of waves traveling with the wind speed, are not accounted for in current theories of stratified wave turbulence. © 2015 American Physical Society.
author	Mininni, Pablo Daniel
author_facet	Mininni, Pablo Daniel
author_sort	Mininni, Pablo Daniel
title	Absorption of waves by large-scale winds in stratified turbulence
title_short	Absorption of waves by large-scale winds in stratified turbulence
title_full	Absorption of waves by large-scale winds in stratified turbulence
title_fullStr	Absorption of waves by large-scale winds in stratified turbulence
title_full_unstemmed	Absorption of waves by large-scale winds in stratified turbulence
title_sort	absorption of waves by large-scale winds in stratified turbulence
publishDate	2015
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15393755_v91_n3_p_ClarkDiLeoni http://hdl.handle.net/20.500.12110/paper_15393755_v91_n3_p_ClarkDiLeoni
work_keys_str_mv	AT mininnipablodaniel absorptionofwavesbylargescalewindsinstratifiedturbulence
_version_	1768545113914474496

Absorption of waves by large-scale winds in stratified turbulence

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